Moving Sphere - Stationary AABB Intersection Test
Posted on 2006-03-20
I'm busy implementing the collision detection section of my 3d engine, and have hit a snag. I have created an octree and divided the polys into the tree where they should be. What i want to be able to do is to find if there is a collision between my moving camera (sphere) and a node's bounding box (an AABB). So far I have managed to find lots of info about every configuration of collision detection, except the one i actually need. I have a good stationary sphere intersection routine, but that won't help if the sphere is moving too fast and passes right through the AABB. No intersection will be found, because there is no intersection between the sphere and the AABB at the starting point, and none found at the end point. I have a starting position, and ending position, and a radius for the sphere, and the center and the half distances on each axis for the AABB. With this info, I need to find out if the sphere will intersect the AABB. This section of code is going to be running in a time critical section, so can't afford to be slow.
Any help would be greatly appreciated.